2.2. Culture media
The basic culture media- MR medium [10], nitrogen-limited
MR medium [14], phosphorus-limited MR medium [5] (per liter)
contained 4.0 g (NH4)2HPO4, 0.8 g MgSO4·7H2O, 0.8 g citric acid
and 6.67 g KH2PO4, 10 ml TES-I and 1 ml TES-II. Trace-element
solution I (TES-I) (in 1.0 L) contained 5.0 g Fe(III)–NH4–citrate and
2.0 g CaCl2·2H2O. Trace-element solution II (TES-II) (prepared in
1.0 N HCl) contained 100 mg ZnSO4·7H2O, 30 mg MnCl2·4H2O,
300 mg H3BO3, 200 mg CoCl2·6H2O, 10 mg CuSO4·5H2O, 20 mg
NiCl2·6H2O and 30 mg Na2MoO4·2H2O. For two-stage fermentation,
MR medium was used for cell growth in first-stage culture.
Nitrogen-limited or phosphorus-limited MR media were adopted
for PHA production in second stage culture.
2.2. Culture mediaThe basic culture media- MR medium [10], nitrogen-limitedMR medium [14], phosphorus-limited MR medium [5] (per liter)contained 4.0 g (NH4)2HPO4, 0.8 g MgSO4·7H2O, 0.8 g citric acidand 6.67 g KH2PO4, 10 ml TES-I and 1 ml TES-II. Trace-elementsolution I (TES-I) (in 1.0 L) contained 5.0 g Fe(III)–NH4–citrate and2.0 g CaCl2·2H2O. Trace-element solution II (TES-II) (prepared in1.0 N HCl) contained 100 mg ZnSO4·7H2O, 30 mg MnCl2·4H2O,300 mg H3BO3, 200 mg CoCl2·6H2O, 10 mg CuSO4·5H2O, 20 mgNiCl2·6H2O and 30 mg Na2MoO4·2H2O. For two-stage fermentation,MR medium was used for cell growth in first-stage culture.Nitrogen-limited or phosphorus-limited MR media were adoptedfor PHA production in second stage culture.
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